Method for the production of urea of high mechanical strength

Details Method for the production of urea of high mechanical strength Method for the production of urea of high mechanical strength

1978-09-13

1980-05-20

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From aldehyde or derivative thereof as reactant

C08G 1212

Patent

active

042040531

ABSTRACT:
A method for the production of urea of high mechanical strength by the crystallizing process or the evaporation process, including a prilling or granulating step, utilizing 0.01-1% by weight of formaldehyde in the form of a formaldehyde polymer, which comprises, before prilling or granulating, incorporating in the urea, a formaldehyde polymer with a formaldehyde content of 82-97% and with a melting point of about 90.degree.-160.degree. C.

REFERENCES:
Walker, J. Frederic, Formaldehyde (3rd Ed), American Chemical Society Monograph Series, No. 159, Reinhold Co., N.Y., 1964, p. 142, table 59.

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